CN101997641B - Method and system for improving packet transmission speed - Google Patents
Method and system for improving packet transmission speed Download PDFInfo
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- CN101997641B CN101997641B CN 200910167102 CN200910167102A CN101997641B CN 101997641 B CN101997641 B CN 101997641B CN 200910167102 CN200910167102 CN 200910167102 CN 200910167102 A CN200910167102 A CN 200910167102A CN 101997641 B CN101997641 B CN 101997641B
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Abstract
The invention provides a method and a system for improving packet transmission speed. The method comprises the following steps: a data sender receives a receiving answer message sent from a data receiver; the data sender compares the current receiving answer message with a sending window used during receiving the previous answer message and judges whether the sending window of the sender moves forwards or not; and if so, the sender determines a bitmap interval for deferred processing according to different link characteristics and does not process instructions which are in the bitmap intervalfor deferred processing and are not received correctly. By using the invention, an area with the possibility of false retransmission is determined according to link characteristics, and the instructions which are in the area with the possibility of false retransmission and are not received correctly are neglected and not processed, thereby effectively avoiding unmeaning retransmission of data blocks caused by error answers.
Description
Technical field
The invention belongs to the transmission technique field in the communication system, relate in particular to a kind of MS (MobileStation, travelling carriage) improves the downlink grouped transmission rate in the unsettled situation of wireless environment method and system.
Background technology
Mobile communication and or digital transmission system in, often can use selectivity ARQ (Automatic Repeat-reQuest, arq) mechanism in the data service.In GSM (Global Systemfor Mobile Communications, global system for mobile communications), RLC (Radio Link Control, Radio Link control) layer has just adopted selectivity ARQ mechanism to guarantee the accurate transmission of data.ARQ mechanism on the RLC is supported two kinds of operator schemes: RLC affirmation mode and RLC Unacknowledged Mode.According to different demands, network can reconfigure by grouping downlink appointment or grouping time slot, sets the RLC operator scheme of descending TBF (Temporary Block Flow, Temporary Block Flow).Under the RLC affirmation mode, in order to improve the reliability of re-transmission, at transmit leg the RLC piece that will transmit is numbered, and selects sliding window to transmit.The recipient is by periodic Ack/Nack (confirming/unconfirmed) information, and the correctness that data block is received represents to confirm.
MS in the transmitted in packets and BSC (Base System Control, base station controller) all is the mechanism that adopts sliding window, receiving-transmitting sides respectively has a cover transmitting-receiving window, after the recipient receives the data of some, can send acknowledge message to transmit leg, or answer the transmit leg requirement constantly to send acknowledge message concrete, inform the situation of the current receive window of transmit leg, if there is not the piece of state unconfirmed, then the transmit leg window is to front slide.With VQ and two state variables of VR receive window is described the recipient, VQ represents not to be correctly received the earliest or missing data piece piece number, the next new piece piece that will receive of VR indication number, VR moves to immediately following this that data block after new after MS receives a new piece.When sending descending replying, mobile phone puts that all unreceived data blocks are NACK between VQ to VR, and BSC will retransmit according to the NACK indication.Yet be not under all situations packet all be the order arrive at the recipient's.For example: in the unsettled situation of wireless environment because the shake in network link time delay or the IP link transmission process, again or the high signaling piece of priority seized the channel of data block so that data block delay transmission.These can cause packet reordering to arrive at the recipient.And for example: when using the IP circuit, the different pieces of information bag may select different routes to arrive at the recipient, causes and sends out first the phenomenon that arrives afterwards.When after a data block that arrives first received by MS, if MS this moment answers BSC to require to send descending replying, think that in this descending replying those data blocks of sending out first are NACK (correctly receive), yet MS may receive in extremely of short duration moment that after sending descending replying those send out first and the data block that do not arrive.To retransmit this data block after BSC receives descending replying, this moment, one or more data blocks just were repeated to send once.And multiple data block has taken descending radio block resource, has affected the downlink transfer quality.This phenomenon can cause in various degree impact to downlink transfer with descending difference of replying transmission frequency.These pseudo-re-transmission of blocks (receive for those MS reality, but still the data block that is repeated to send by network is referred to herein as pseudo-re-transmission of blocks) to have identical characteristics be exactly because due to chain-circuit time delay or the shake, it all is in the rear portion of replying the bitmap indication, and its scope also can be decided according to Linktype.Reply bitmap indication, refer to the bitmap that carries in the response message, it is used to indicate the reception condition of receiving side data piece, and to be that 1 expression is correct receive general indicating bit, and 0 expression correctly receives.
Publication number is the Chinese patent " method of transporting acknowledged information/non-acknowledged information in communication system " of CN101212283, proposed a kind of in communication system the method for transferring ACK/nack message, avoided the misunderstanding that transmitting terminal produces in the prior art, prevented unnecessary re-transmission, save Radio Resource, reduced propagation delay time.But the described method of this patent can only realize the recipient, be not suitable for improving the transmitted in packets under the point-to-multipoint communication mode, and its described method has just avoided sending the possibility of wrong responses, and what can not solve that the receiving side data bag incorrect order that causes owing to reasons such as time delay or IP link flappings causes repeats to send phenomenon.
In agreement 3GPP TS 44.060, only provided the basic skills that ACK/NACK (confirming/unconfirmed) pattern realizes, do not considered that the mistake that the reasons such as time delay, packet reordering cause retransmits phenomenon.Therefore we are necessary to study and propose the quality that corresponding solution improves transmitted in packets.
Summary of the invention
Technical problem to be solved by this invention provides the method and system that improve packet transmission rate in a kind of communication system, avoids the unnecessary re-transmission of transmit leg, saves Radio Resource, improves the transmitted in packets quality.
In order to solve the problems of the technologies described above, the invention provides a kind of method that improves packet transmission rate, comprising:
Data receiver receives the reception response message that sends from the data receiver;
Send window when data receiver receives response message with this reception response message with the last time is made comparisons, and judges whether the send window of transmit leg moved forward;
Moved if determine the send window of transmit leg, then transmit leg is determined to delay between the bit map area of processing according to different link properties, and receives indication and do not process being positioned at correct between the described bit map area of delaying processing.
In order to solve the problems of the technologies described above, the present invention also provides a kind of system that improves packet transmission rate, comprising:
Receiver module is used for receiving the reception response message that sends from the data receiver;
Comparison module is used for that this is received response message and makes comparisons with last send window when receiving response message, judges whether the send window of transmit leg moved forward; Moved if determine the send window of transmit leg, then sent one first index signal;
Processing unit is used for determining to delay between the bit map area of processing according to different link properties after receiving described the first index signal, and receives to indicate and do not process being positioned at correct between the described bit map area of delaying processing.
The present invention determines to occur the pseudo-zone that retransmits according to link property, such as locating N according to TBF type and coded system, N is the piece number that possible have the wrong responses indication, and refers to that MS is in N the data block that receives at last when network sends descending replying.For the data block in the N scope not, by agreement regulation flow operations, indicate the processing that to be left in the basket for the NACK in the N scope, thereby effectively avoided the meaningless re-transmission of the data block that wrong responses causes, these wrong responses can be that the packet delay that causes on link delay or the various logic flow process causes.The present invention is according to some problems that run in the practical implementation, corresponding solution has been proposed, remedied the misunderstanding that receiving terminal produces in the prior art, prevented unnecessary re-transmission, saved Radio Resource, and effectively promoted the speed of transmitted in packets, remedied in the existing protocol deficiency to ACK/NACK (confirming/unconfirmed) pattern description.
Description of drawings
Figure 1A is the method realization flow figure of the raising packet transmission rate in the embodiment of the invention;
Figure 1B is step 104 idiographic flow schematic diagram among Figure 1A;
Fig. 2 is the flow chart of application example of the present invention;
Fig. 3 is the system block diagram of the raising packet transmission rate in the embodiment of the invention.
Embodiment
Main thought of the present invention is: determine to occur the pseudo-zone that retransmits, the indicating bit in this zone is not processed.And do not stop the characteristic that moves forward according to send window, the final area of previous response message Bitmap indication also can be done corresponding movement, so above-mentioned indicating bit that does not process, reply middle will leaving the pseudo-zone that retransmits may occur follow-up, unless the transmit leg data are sent fully, perhaps send window is stagnated, this moment, send window can not move forward, bitmap indicating bit in the response message can not done corresponding movement yet,, will process by agreement 3GPP TS 44.060 designation methods in the complete or stagnation situation for send window.
Along with the recipient ceaselessly receives new data, bitmap entrained in the response message of its transmission also can change thereupon, final area is the reception condition of the new data block after being used to indicate time of reception point and leaning in the bitmap indication, and its can do to move accordingly along with the recipient does not stop to receive new data block.
In order to make purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, is not intended to limit the present invention.
Shown in Figure 1A, be the method realization flow figure of the raising packet transmission rate in the embodiment of the invention, described method is carried out according to the following steps:
Step 101: data receiver receives the reception response message that sends from the data receiver;
Step 102: data receiver receives response message with this and makes comparisons with last send window when receiving response message, and whether the send window of judging transmit leg the forward movement mistake.If moved then execution in step 104; If do not move then execution in step 103;
Step 103: according to former flow processing bitmap indication, namely agreement 3GPP TS 44.060 regulation flow processs are not changed, finish;
Step 104: according to different link properties, determine to delay between the bit map area of processing, and bitmap NACK (the correctly not receiving) indication that is positioned at above-mentioned interval is not processed, namely do to ignore processing.
Shown in Figure 1B, wherein, affiliated step 104 idiographic flow carries out according to the following step:
Step 1041: according to different link properties, A between the bit map area of delaying processing is set.Can determine A between above-mentioned bit map area according to the characteristic of IP link flapping situation, chain-circuit time delay and link property-preferentially seize the data block transmitting channel such as the signaling piece;
Because after interval A leans on, that is to say that the border of interval A is the bitmap of response message indicating largest block number reception condition, the another one border is decided by different link properties.According to different link properties, A between the bit map area of delaying processing is set described in the step 1041, a kind of realization specifically is:
According to the definite piece number that may have the mistake indication of different link properties, as the size of A between the bit map area of delaying processing;
Obtain the bitmap of response message indicating largest block number reception condition, as the last bitmap of A between the bit map area of delaying processing;
Determine A between the described bit map area of delaying processing according to the size of A between the last bitmap between the bit map area of delaying processing and the described bit map area of delaying processing.
In a preferred embodiment of the present invention, described according to the definite piece number that has wrong indication of different link properties when described link property is the Temporary Block Flow type, comprising:
Be Enhanced GPRS when determining the Temporary Block Flow type, judge further then whether the coded system type that adopts is the dynamic coding mode;
Be the dynamic coding mode when determining the coded system type, the number of channel that takies of the order Temporary Block Flow that exists the piece number of wrong indication to equal 2 times then, process ends;
Be the static coding mode when determining the coded system type, judge further that then whether coded system is more than or equal to MCS (Modulation and Coding Scheme, modulation coding mode) 7;
When determining coded system more than or equal to MCS7, the number of channel that the Temporary Block Flow that then makes the piece number that has wrong indication equal 2 times takies, process ends;
When determining coded system less than MCS7, then order exists the piece number of wrong indication to equal the channel religion that Temporary Block Flow takies, process ends.
Step 1042: get current pending bitmap indicating bit in the response message, namely in subsequent step, begin the indicating bit of the data block accepting state processed;
Step 1043: whether the accepting state of judging the corresponding data piece that this indicating bit is indicated is NACK.If the accepting state of data block is NACK, then execution in step 1044.If the non-NACK state of data block accepting state is the ACK state, then execution in step 1047;
Step 1044: judge whether the current bitmap indicating bit of processing falls within the interval A.If fall within the interval A, then execution in step 1045, if do not fall within the interval A, then execution in step 1046;
Step 1045: this bitmap indicating bit is not dealt with.
Do not process in the step 1045 is because this indicating bit may be because chain-circuit time delay causes misdirection, the indication of NACK bitmap does not process the response message of this reception in the regional A to falling within, treat follow-up receiving when replying, because the forward movement of send window, the bitmap indication that originally fell within the interval A will be left the A interval, just process at that time, also may originally fall within the bitmap indication of NACK in the interval A, in follow-up replying, be set ACK.This just is equivalent to process for the bitmap indication time-delay that may lead to errors; Execution in step 1048.
Step 1046: according to former flow processing NACK indicating bit." by former flow processing " refers to process according to the method for processing NACK among the agreement 3GPP TS 44.060 and reply indicating bit in this step.Execution in step 1048.
Step 1047: according to former flow processing ACK indicating bit." by former flow processing " refers to process according to the method for processing ACK among the agreement 3GPP TS 44.060 and reply indicating bit in this step.Execution in step 1048.
Step 1048: judge whether the bitmap indicating bit all is disposed, if all be disposed, process ends then; If all do not handle, then execution in step 1042, process the next one and reply indicating bit.
As shown in Figure 2, be the flow chart of application example of the present invention.The method of application example of the present invention specifically can be implemented according to the following procedure:
Step 205:BSC receives the descending response message that sends from mobile phone;
Step 206: compare with the send window in the front response message, judge whether send window moved forward; If window occured mobile, execution in step 210; If window did not move, execution in step 207;
Step 207: according to former flow processing bitmap indication, execution in step 285;
Step 210: judge the TBF type, be EGPRS (Enhanced GPRS) type execution in step 215;
Step 215: judge the coded system type that adopts, be static coding mode execution in step 220; Be dynamic coding mode execution in step 225 then;
Step 220: whether judge coded system more than or equal to MCS7, more than or equal to execution in step 235; Less than MCS7 execution in step 230;
Step 225: the number of channel that the TBF that exists the piece number (representing with N) of wrong indication to equal 2 times takies, i.e. N=2*ChlNum, execution in step 245; Because each radio block carries two RLC pieces under MCS 7-MCS 9 coded systems, therefore having the zone of fail bit map indicating bit is the twice of other situations;
Step 235: the number of channel that the TBF that exists the piece number of wrong indication to equal 2 times takies, i.e. N=2*ChlNum, execution in step 245;
Step 230: exist the piece number of wrong indication to equal the number of channel that TBF takies, i.e. N=ChlNum, execution in step 245;
The N that determines in above-mentioned steps 210, step 215, step 220, the step 235 is namely in order to locate the zone that may have the fail bit map indication;
Step 245:X deposits when the bitmap of pre-treatment and indicates corresponding transmission data block sequence number BSN, in acknowledge message, each of bitmap has all been indicated the accepting state of corresponding data piece, indicate at the bitmap that transmit leg will be processed in these message successively, X is exactly that current pending bitmap is indicated corresponding transmission data block number;
Step 250: judge that piece number that BSN equals X whether in the indicating range of bitmap, is execution in step 255; No, execution in step 285.
Step 255: judging that reply the data block that middle BSN equals X indicates whether to be NACK, is then to carry out 260; No, then carry out 275;
Step 260: judging whether data block that BSN equals X is contained in last N the data block that bitmap describes, is that then execution in step 270; No, then execution in step 265;
265: the data block of putting BSN and be X is NACK, retransmits execution in step 280;
Step 270: the data block that BSN is equaled X is not done the NACK processing, namely still keeps Pending (to be determined) state; Execution in step 280;
Step 280:X equals BSN number of next data block, and goes to step 250;
Step 285: finish the reply process flow process.
With reference to shown in Figure 3, be the system block diagram of the raising packet transmission rate in the embodiment of the invention.Described system comprises:
Wherein, described processing unit is determined between above-mentioned bit map area according to IP link flapping situation, chain-circuit time delay and link property.
In the preferred embodiment of the invention, described link property comprises: the signaling piece is preferentially seized characteristic, Temporary Block Flow type, coded system of data block transmitting channel etc.
In the preferred embodiment of the invention, described processing unit 303 further comprises:
The first determination module 3034 is used for determining to exist wrong piece number of indicating according to different link properties, as the size between the bit map area of delaying processing;
The second determination module 3035 is for the bitmap that obtains response message indicating largest block number reception condition, as the last bitmap between the bit map area of delaying processing;
Obtain module 3031, be used for obtaining the current pending bitmap indicating bit of response message;
The first judge module 3032 is used for judging whether the accepting state of the corresponding data piece that this bitmap indicating bit is indicated is correct reception indication; Be the correct indication that receives when determining, then send one second index signal;
The second judge module 3033 is in being used for judging after receiving described the second index signal whether the current bitmap indicating bit of processing falls between described bit map area; When determining in described bitmap indicating bit falls between described bit map area, then correctly receive indication and do not process described.
In a preferred embodiment of the invention, described link property is the Temporary Block Flow type, and described the first determination module 3034 is used for:
Be Enhanced GPRS when determining the Temporary Block Flow type, judge further then whether the coded system type that adopts is the dynamic coding mode;
Be the dynamic coding mode when determining the coded system type, the number of channel that takies of the order Temporary Block Flow that exists the piece number of wrong indication to equal 2 times then;
Be the static coding mode when determining the coded system type, judge further that then whether coded system is more than or equal to MCS7;
When determining coded system more than or equal to MCS7, the number of channel that the Temporary Block Flow that then makes the piece number that has wrong indication equal 2 times takies;
When determining coded system less than MCS7, then order exists the piece number of wrong indication to equal the number of channel that Temporary Block Flow takies.
N locates by TBF type and coded system in said method and system, and N is the piece number that possible have the wrong responses indication, and refers to that MS is in N the data block that receives at last when network sends descending replying.For the data block in the N scope not, by agreement regulation flow operations, indicate the processing that to be left in the basket for the NACK in the N scope, thereby effectively avoided the meaningless re-transmission of the data block that wrong responses causes, remedied the misunderstanding that receiving terminal produces in the prior art (referring to the fail bit map indication), prevent unnecessary re-transmission, saved Radio Resource, and effectively promoted the speed of transmitted in packets.
It is pointed out that illustrating of above-mentioned each concrete steps is comparatively concrete, can not therefore think the restriction to scope of patent protection of the present invention, scope of patent protection of the present invention should be as the criterion with claims.
Claims (8)
1. a method that improves packet transmission rate is characterized in that, comprising:
Data receiver receives the reception response message that sends from the data receiver;
Send window when data receiver receives response message with this reception response message with the last time is made comparisons, and judges whether the send window of transmit leg moved forward;
Moved if determine the send window of transmit leg, then transmit leg is determined to delay between the bit map area of processing according to different link properties, and receives indication and do not process being positioned at correct between the described bit map area of delaying processing;
Wherein, determine to delay between the bit map area of processing according to different link properties, comprising: determine to exist wrong piece number of indicating according to different link properties, as the size between the bit map area of delaying processing; Obtain the bitmap of response message indicating largest block number reception condition, as the last bitmap between the bit map area of delaying processing; Determine between the described bit map area of delaying processing according to the size between the last bitmap between the bit map area of delaying processing and the described bit map area of delaying processing.
2. the method for claim 1 is characterized in that, described different link properties comprise:
IP link flapping situation, chain-circuit time delay, signaling piece are preferentially seized one or more in the characteristic, Temporary Block Flow type, coded system of data block transmitting channel.
3. the method for claim 1 is characterized in that, described link property is the Temporary Block Flow type, and is described according to the definite piece number that has wrong indication of different link properties, comprising:
Be Enhanced GPRS when determining the Temporary Block Flow type, judge further then whether the coded system type that adopts is the dynamic coding mode;
Be the dynamic coding mode when determining the coded system type, the number of channel that takies of the order Temporary Block Flow that exists the piece number of wrong indication to equal 2 times then, process ends;
Be the static coding mode when determining the coded system type, judge further that then whether coded system is more than or equal to modulation coding mode 7;
When determining coded system more than or equal to modulation coding mode 7, the number of channel that the Temporary Block Flow that then makes the piece number that has wrong indication equal 2 times takies, process ends;
When determining coded system less than modulation coding mode 7, then order exists the piece number of wrong indication to equal the number of channel that Temporary Block Flow takies, process ends.
4. the method for claim 1 is characterized in that, describedly receives indication and does not process being positioned at correct between the described bit map area of delaying processing, comprising:
Obtain current pending bitmap indicating bit in the response message;
Whether the accepting state of judging the corresponding data piece that this bitmap indicating bit is indicated is correct reception indication;
The correct indication that receives when determining described accepting state, judge then whether the current bitmap indicating bit of processing falls between the described bit map area of delaying processing in;
When determining in described bitmap indicating bit falls between the described bit map area of delaying processing, then correctly receive indication and do not process described.
5. a system that improves packet transmission rate is characterized in that, comprising:
Receiver module is used for receiving the reception response message that sends from the data receiver;
Comparison module is used for that this is received response message and makes comparisons with last send window when receiving response message, judges whether the send window of transmit leg moved forward; Moved if determine the send window of transmit leg, then sent one first index signal;
Processing unit is used for determining to delay between the bit map area of processing according to different link properties after receiving described the first index signal, and receives to indicate and do not process being positioned at correct between the described bit map area of delaying processing;
Described processing unit further comprises: the first determination module is used for determining to exist wrong piece number of indicating according to different link properties, as the size between the bit map area of delaying processing; The second determination module is for the bitmap that obtains response message indicating largest block number reception condition, as the last bitmap between the bit map area of delaying processing; Determination module between bit map area is used for determining between the described bit map area of delaying processing according to the size between the last bitmap between the bit map area of delaying processing and the described bit map area of delaying processing.
6. system as claimed in claim 5, it is characterized in that described processing unit is preferentially seized in the characteristic, Temporary Block Flow type, coded system of data block transmitting channel one or more and determined between the described bit map area of delaying processing according to IP link flapping situation, chain-circuit time delay, signaling piece.
7. system as claimed in claim 5 is characterized in that, described link property is the Temporary Block Flow type, and described the first determination module is used for:
Determining the Temporary Block Flow type is Enhanced GPRS, judges further then whether the coded system type that adopts is the dynamic coding mode;
Be the dynamic coding mode when determining the coded system type, the number of channel that takies of the order Temporary Block Flow that exists the piece number of wrong indication to equal 2 times then;
Be the static coding mode when determining the coded system type, judge further that then whether coded system is more than or equal to modulation coding mode 7;
When determining coded system more than or equal to modulation coding mode 7, the number of channel that the Temporary Block Flow that then makes the piece number that has wrong indication equal 2 times takies;
When determining coded system less than modulation coding mode 7, then order exists the piece number of wrong indication to equal the number of channel that Temporary Block Flow takies.
8. system as claimed in claim 5 is characterized in that, described processing unit further comprises:
Obtain module, be used for obtaining the current pending bitmap indicating bit of response message;
The first judge module is used for judging whether the accepting state of the corresponding data piece that this bitmap indicating bit is indicated is correct reception indication; Be the correct indication that receives when determining, then send one second index signal;
The second judge module is in being used for judging after receiving described the second index signal whether the current bitmap indicating bit of processing falls between described bit map area; When determining in described bitmap indicating bit falls between the described bit map area of delaying processing, then correctly receive indication and do not process described.
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| PL3641197T3 (en) * | 2017-06-16 | 2024-04-15 | Wilus Institute Of Standards And Technology Inc. | Method, apparatus, and system for transmitting or receiving control channel and data channel in wireless communication system |
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| CN1567766A (en) * | 2003-06-12 | 2005-01-19 | 中兴通讯股份有限公司 | Method for controlling transmission window of wireless link layer |
| CN1984074A (en) * | 2006-06-16 | 2007-06-20 | 华为技术有限公司 | Method for receiving service |
| CN101359980A (en) * | 2008-09-05 | 2009-02-04 | 华为技术有限公司 | Exception processing method in RLC data transmission process |
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| ES2380787T3 (en) * | 2006-05-16 | 2012-05-18 | Nokia Siemens Networks Gmbh & Co. Kg | Method for securely transmitting short ACK / NACK bitmaps in an ARQ process within EDGE compatible systems |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1567766A (en) * | 2003-06-12 | 2005-01-19 | 中兴通讯股份有限公司 | Method for controlling transmission window of wireless link layer |
| CN1984074A (en) * | 2006-06-16 | 2007-06-20 | 华为技术有限公司 | Method for receiving service |
| CN101359980A (en) * | 2008-09-05 | 2009-02-04 | 华为技术有限公司 | Exception processing method in RLC data transmission process |
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